polish or lemon stablecoop bantam egg?

i have just got a polish hen who is going to lay any day now, but also my bantams are supposed to start laying again because they have just finished their moult. I read online that polish eggs are small, smooth and white, but so are bantams! heres a picture. i put one of my other hens eggs in it to show you the size. also my other hens lay huge eggs, so the bantam or polish eggs aren't as small as they look!